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INVESTMENT SECURITIES - Fair value of impaired investment securities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Mar. 31, 2020
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value $ 1,998 $ 16,233
Less than 12 months, Unrealized Losses (9) (90)
12 months or longer, Estimated Fair Value 4,787 5,320
12 months or longer, Unrealized Losses (101) (101)
Total, Estimated Fair Value 6,785 21,553
Total, Unrealized Losses (110) (191)
Agency securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value 1,998 1,998
Less than 12 months, Unrealized Losses (9) (10)
12 months or longer, Estimated Fair Value   0
12 months or longer, Unrealized Losses   0
Total, Estimated Fair Value 1,998 1,998
Total, Unrealized Losses (9) (10)
Residential mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [1]   2,509
Less than 12 months, Unrealized Losses [1]   (22)
12 months or longer, Estimated Fair Value [1]   409
12 months or longer, Unrealized Losses [1]   (8)
Total, Estimated Fair Value [1]   2,918
Total, Unrealized Losses [1]   (30)
Other mortgage-backed securities    
Debt Securities, Available-for-sale [Line Items]    
Less than 12 months, Estimated Fair Value [2] 0 11,726
Less than 12 months, Unrealized Losses [2] 0 (58)
12 months or longer, Estimated Fair Value [2] 4,787 4,911
12 months or longer, Unrealized Losses [2] (101) (93)
Total, Estimated Fair Value [2] 4,787 16,637
Total, Unrealized Losses [2] $ (101) $ (151)
[1] Comprised of FHLMC and FNMA issued securities.
[2] Comprised of SBA and CRE secured securities issued by FNMA.